Fully automated steel plant - video

Fully automated steel plant.

https://www.youtube.com/watch?v=8nbsPXqr_4A


Previously:

https://www.homemadetools.net/forum/...980#post133896
https://www.homemadetools.net/forum/...2398#post96218
https://www.homemadetools.net/forum/...2773#post97101
https://www.homemadetools.net/forum/...771#post140133
https://www.homemadetools.net/forum/...966#post148928

What happens to the slag and remaining iron in the vessel after an exchange?

(be gentle, I'm ignorant of steel manufacturing.)